Background:

Intestinal disaccharidases can be partially inhibited or stimulated in the presence of fiber.

Objective:

To evaluate the effect of fibrous residues of oats (Avena sativa) and black beans (Phaseolus vulgaris) on the “in vitro” activity of the intestinal disaccharidases.

Materials and Methods:

15 Sprague Dawley rats, were divided into three groups: control, fed with bean flour, and fed with oatmeal flour for 21 days. Homogenate was obtained by scraping the mucosa. The determination of enzymatic activity of the disaccharidases was measured by the enzymatic method, in the presence of its natural substrate and with addition of the fibrous residues obtained from the oatmeal and black beans, in concentration of 2.5 % (W/V).

Results:

The highest enzymatic activity was recorded in the middle intestinal region for each enzyme (p <0.05). The order of enzymatic activity in mg glucose / mg protein / min was maltase (0.149) sucrase (0.096) and lactase (0.014) (p<0.05). Maltase was inhibited to a greater extent by bean residue; sucrase by oat residue and lactase by both.

Conclusion:

The addition of purified fiber of oats and bean produced a significant decrease in the in vitro activity of the intestinal disaccharidases, especially in the presence of the bean residue.

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